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    <TITLE>package org.geotools.datum</TITLE>
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  {@linkplain org.geotools.referencing.datum.AbstractDatum Datum} implementation. An explanation for this
  package is provided in the {@linkplain org.opengis.referencing.datum OpenGIS&reg; javadoc}.
  The remaining discussion on this page is specific to the Geotools implementation.

  <H3>Extensions to OpenGIS API</H3>
  <P ALIGN="justify">Convenience methods were added to the
  {@linkplain org.geotools.referencing.datum.DefaultEllipsoid default ellipsoid}
  class in order to compute orthodromic distance.</P>
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